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crack up
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Also available:
World English Dictionary
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crackerjack
crack·er·jack
[
krákər jàk
]
adjective
Definition:
excellent:
outstanding in quality or ability
(
dated informal
)
[
Late 19th century. <cracker "excellent" + jack
1
"man"
]
crack·er·jack
noun
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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